A cool feature in Outlook.com is the ability to add multiple accounts. And once you do, it’s easy to choose the account you send a message from. Here’s a quick tip on how to do it.
If you haven’t added other accounts to your Outlook.com account, check out our article on how to add Gmail to Oultook.com. Adding other Microsoft Live, Hotmail, and Outlook.com addresses is even easier.
After you’ve added your other account(s) when compose a new message, click your name in the upper left corner and select eh one you want to send the message from.
Also, if you have an main account you use most often, you can set it as your default in Outlook.com.